Question

Can we only use payloads created with metasploit?

Would it be a problem if we use another payload developed in C ++?

Hi kenan3507,
sorry for the really late answer. You can of course use payloads developed in C++.
Compile it to an executable and use pe_to_shellcode to convert it to shellcode format.

You can take a look at this section to get an idea.
Here we convert mimikatz.exe to shellcode:

avet/build/build_rc4enc_mimikatz_win64.sh

Lines 38 to 40 in 9dd9433

    
           # convert mimikatz executable into shellcode format 
        
           # Can be of course used with other .exe files 
        
           wine ./../pe_to_shellcode/pe2shc.exe input/mimikatz.exe input/sc_raw.txt

	# convert mimikatz executable into shellcode format
	# Can be of course used with other .exe files
	wine ./../pe_to_shellcode/pe2shc.exe input/mimikatz.exe input/sc_raw.txt